HD26LS31P(E) - RENESAS TECHNOLOGY

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Rev.2.00, Jul.16.2004, page 1 of 11

HD26LS31

Quadruple Differential Line Drivers With 3 State Outputs

REJ03D0294–0200Z

(Previous ADE-205-576 (Z))

Rev.2.00

Jul.16.2004

Description

The HD26LS31 features quadruple differential line drivers which satisfy the requirements of EIA standard RS-422A.

This device is designed to p r ovide differential signals with high current capability on bu s lines. The circuit provides

enable input to control all four drivers. The output circuit has acti ve pul l up and pull down and is capable of sinking or

sourcing 40 mA.

Features

• Ordering Infor mation

Part Name Package Type Package Code Package

Abbreviation Taping Abbreviation

(Quantity)

HD26LS31P DILP-16 pin DP-16E, -16FV P —

Logic Diagram

Enable G

HD26LS31

Rev.2.00, Jul.16.2004, page 2 of 11

Pin Arrangement

(Top view)

GND

Enable G

16 VCC

Enable G

Function Table

Input Enables Outputs

AG G

GYZ

HH X H L

LH X L H

HX L H L

LXLLH

XL H Z Z

H : High level

L : Low level

X : Irrelevant

Z : High impedance (Off)

Absolute Maximum Ratings

Item Symbol Ratings Unit

Supply Voltage VCC 7.0 V

Input Voltage VIN 7.0 V

Output Voltage VOUT 5.5 V

Power Dissipation PT1W

Storage Temperature Range Topr 0 to +70 °C

Lead Temperature Range Tstg –65 to +150 °C

Note: 1. The absolute maximum ratings are values which must not individually be exceeded, and furthermore, no two

of which may be realized at the same time.

Recommended Operating Conditions

Item Symbol Min Typ Max Unit Application Terminal

Supply Voltage VCC 4.75 5.0 5.25 V VCC

Output Current IOH — — –40 mA All Output

Output Current IOL ——40mAAll Output

Operating Temperature Topr 0 25 70 — —

HD26LS31

Rev.2.00, Jul.16.2004, page 3 of 11

Electrical Characteristics (Ta = 0 to +70°C)

Item Symbol Min Typ*1Max Unit Application

Terminal Conditions

Input Voltage VIH 2.0 — — V All Inputs

VIL ——0.8

Input Clamp Voltage VIK — — –1.5 VCC = 4.75 V, II = –18 mA

Output Voltage VOH 2.5 — — All Outputs VCC = 4.75 V IOH = –20 mA

VOH ——2.4 I

OH = –40 mA

VOL ——0.5 I

OL = 40 mA

Output Current IOZL — — –20 mA VCC = 5.25 V VO = 0.5 V

IOZH ——20 V

CC = 5.25 V VO = 2.5 V

Input Current II— — 0.1 mA All Inputs VCC = 5.25 V VI = 7 V

IIH ——20µA V

I = 2.7 V

IIL — — –0.36 mA VI = 0.4 V

Short Circuit Output

Current

IOS*2–30 — –150 All Outputs VCC = 5.25 V

Supply Current ICC —3280 V

CC VCC = 5.25 V

Notes: 1. All typical values are at VCC = 5 V, Ta = 25°C

2. Not more than one output should be shorted at a time and duration of the short circuit should not exceed one

second.

Switching Characteristics (VCC = 5 V, Ta = 25°C)

Item Symbol Min Typ Max Unit Application

terminal Test

circuit Conditions

Propagation Delay Time tPLH — 14 20 ns All Outputs 1 CL = 30 pF

tPHL —1420ns

Output Enable Time tZH —2540ns 2 C

L = 30 pF, RL = 75 Ω

tZL —3745ns 3 C

L = 30 pF, RL = 180 Ω

Output Disable Time tHZ —2130ns 2 C

L = 10 pF

tLZ —2335ns 3 C

L = 10 pF

Complementary Output To

Output

Skew —16ns 1 C

L = 30 pF

HD26LS31

Rev.2.00, Jul.16.2004, page 4 of 11

Test Circuit 1

Output

Pulse Generator

PRR = 1MHz

Duty Cycle 50%

Zout = 50Ω

Input

4.5 V

C =

30 pF

C =

30 pF

Note: 1. CL includes probe and jig capacitance.

Waveforms

Input

0.3 V

2.7 V

1.3 V

0 V

3 V

1.3 V

Output Y

VOL

tPHL

tPLH tPHL

1.5 V 1.5 V

VOH

VOL

Output Z

2.7 V

0.3 V

trtf

Skew

tPLH

Skew

HD26LS31

Rev.2.00, Jul.16.2004, page 5 of 11

Test Circuit 2

Pulse Generator

PRR = 1 MHz

Duty Cycle 50%

Zout = 50Ω

Input

4.5 V Output

Output 180 Ω

180 Ω

75 Ω

Note: 1. CL includes probe and jig capacitance.

Waveforms

Enable G

0.3 V

2.7 V

1.5 V

2.7 V

0 V

3 V

1.5 V

0.3 V

Enable G

Output

1.5 V

0.5 V

S1 Open

S1 : Closed

0 V

1.5 V

S1 : Open

HD26LS31

Rev.2.00, Jul.16.2004, page 6 of 11

Test Circuit 3

VCC

Pulse Generator

PRR = 1 MHz

Duty Cycle 50%

Zout = 50Ω

Input

4.5 V Output

Output

180 Ω

75 Ω

180 Ω

Note: 1. CL includes probe and jig capacitance.

Waveforms

Enable G

0.3 V

2.7 V

1.5 V

2.7 V

0 V

3 V

1.5 V

0.3 V

Enable G

Output

1.5 V

0.5 V

S2 : Open

4.5 V

1.5 V

S2 : Closed

HD26LS31

Rev.2.00, Jul.16.2004, page 7 of 11

HD26LS31 Line Driver Applications

The HD26LS31 is a line driver that meets the EIA RS-422A conditions, and has been designed to supply a high current

for differential signals to a b us li ne. Its features are listed below.

• Operates on a single 5 V power supply.

• High output impedance when power is off

• Three-state output

• On-chip current limiter circuit

• Sink current and source current both 40 mA

A block diagram is shown in figure 1. The enable function is common to all four drivers, and either active-high or

active-low can be selected.

The output section consists of two output stages (the Y side and Z side), each of which has the same sink current and

source current capacity.

Input is TTL compatible, and an output current limiter circuit is built into the output stage as shown in figure 2.

Enable G

Figure 1 HD26LS31 Block Diagram

The output current limiter circuit consists of transistor Q1 and resistance R1, and operates when the voltage drop on both

sides of R1 reaches approximately 0.7 V. At this ti me the current, i, is as follows:

i = 0.7 (V) / 9 (Ω) ≈ 78 (mA)

When a current greater than this flows, Q1 is turned on, the Q2 base c urrent flo ws to the o utput side, and the flow o f an

excessively large output current is prevented.

However, since this type of current limiter circuit has the characteristics shown in figure 3, the output stage power

dissipation is large.

Therefore, when the output is shorted, this should be limited to a maximum of one second for one pin only.

The IOL vs. VOL characteristic for low-level output is shown in figure 4.

An example of termination resistance connection when the HD26LS31 is used as a balanced differential type driver is

shown.

Output

9 Ω

Figure 2 Output Stage Circuit Configuration

HD26LS31

Rev.2.00, Jul.16.2004, page 8 of 11

When termination resistance RT is connected between the two transmission lines, as shown in figure 7 the current path

situation is that current IOH on the side outputting a high level (in this case, the Y output) flows to the side outputting a

low level (in this case, the Z output) via RT, with the result that the low level rise is large.

If termination resistance RT is dropped to GND on both transmit lines, as shown in figure 5 the current path situation is

that the current that flows into the side outputting a low level (in this case, the Z output) is only t he inp ut bias curre nt

from the receiver. As this input bias current is small compared with the signal current, it has almost no effect on the

differential input signal at the receiver end.

Figure 6 shows the output voltage characteristics when termination resistance RT is varied.

Also, when used in a party line system, etc., the low level rises further due to the receiver input bias current, so that it is

probably advisable to dro p the termination resistance to GND.

However, the fact that it is possible to make the value of RT equal to the characteristic impedance o f the transmission

line offers the advantage of being able to hold the power dissipation on the side outp utti ng a hi gh level to a lower level

than in the above case.

Consequently, the appropriate use must be decided according to the actual operating conditions (transmission line

characteristics, transmission distance, whether a party line is used, etc.).

Figure 8 shows the output voltage characteristics when termination resistance RT is varied.

5.0

4.0

3.0

2.0

1.0

0 –20 –40 –60 –80 –100

Output Current I

(mA)

Output Voltage V

(V)

= 5.25 V

= 4.75 V

= 5.0 V Ta = 25°C

Figure 3 IOH vs. VOH Characteristics

0.5

0.4

0.3

0.2

0.1

0 1020304050

Output Current IOL (mA)

Output Voltage VOL (V)

VCC = 4.75 V

Ta = 25°C

VCC = 5.0 V

VCC = 5.25 V

Figure 4 IOL vs. VOL Character istics

HD26LS31

Rev.2.00, Jul.16.2004, page 9 of 11

"H"

"L"

IOH

IIN (Receiver)

RT = ZO

ZO is the transmission line characteristic

impedance

Figure 5 Example of Driver Use-1

1.0

0.5

0.2

0.1

0.05

10 20 50 100 200 500 1 k 2 k 5 k 10 k 20 k 50 k

Termination Resistance RT (Ω)

Output Voltage VOH (Y), VOL (Z) (V)

VCC = 5 V

Ta = 25°C

"H"

VOH

GND

VOL

VOH (Y)

VOL (Z)

Figure 6 Termination Resistance vs. Output Voltage Characteristics

Y "H"

"L"

IOH

IOL

IIN (Receiver)

RT = ZO

ZO is the transmission line characteristic

impedance

Figure 7 Example of Driver Use-2

HD26LS31

Rev.2.00, Jul.16.2004, page 10 of 11

A feature of terminatio n implemented as shown in figure 9 is that power dissipation is low when the duty of the

transmitted signal is high.

However, care is required, since if RT is sufficiently small, when the output on the pulled-up side goes lo w, since the

inverter transistor (Q4 in figure 2) has no protection circuit, and so a large current will flow and the output low level will

rise.

Figure 10 shows the output voltage characteristics when termination resistance RT is varied.

With the method of using the dr iver describ e d above, if termination resistance RT becomes sufficientl y small, the region

within which the output current limiter circuit operates will be entered, as can be seen from the IOH vs. VOH

characteristics shown in figure 3. In this region, the output sta ge power dissipation is large and the output voltage

changes abruptly. A measure such as insertion of a capacitor in series with the termination resistance is therefore

necessary. Consequently, when selecting the transmission line, the circuit termination resistance to be used requires

careful consideration.

1.0

0.5

0.2

0.1

0.05

10 20 50 100 200 500 1 k 2 k 5 k 10 k 20 k 50 k

Termination Resistance RT (Ω)

Output Voltage VOH (Y), VOL (Z) (V)

VOH (Y)

VOL (Z)

VCC = 5 V

Ta = 25°C

"H"

VOH

GND

VOL

Figure 8 Termination Resistance vs. Output Voltage Characteristics

Data input

Figure 9 Example of Driver Use-3

1.0

0.5

0.2

0.1

0.05

10 20 50 100 200 500 1 k 2 k 5 k 10 k 20 k 50 k

Termination Resistance RT (Ω)

Output Voltage VOH (Y), VOL (Z) (V)

VOL (Y)

VOH (Z)

VCC = 5 V

Ta = 25°C

"L" VOL

GND

RTVOH

VCC

Figure 10 Termination Resistance vs. Output Voltage Characteristic

HD26LS31

Rev.2.00, Jul.16.2004, page 11 of 11

Package Dimensions

19.2

20.32 Max

6.3

7.4 Max

5.06 Max2.54 Min

0.51 Min

Package Code

JEDEC

JEITA

Mass

(reference value)

DP-16E

Conforms

1.05 g

2.54 ± 0.25 0.48 ± 0.1

0.89 1.3 7.62

0.25+ 0.1

– 0.05

0˚ – 15˚

As of January, 2003

Unit: mm

19.2

20.32 Max

6.3

7.4 Max

5.06 Max2.54 Min

0.51 Min

Package Code

JEDEC

JEITA

Mass

(reference value)

DP-16FV

Conforms

1.05 g

2.54 ± 0.25

*NI/Pd/AU Plating

*0.48 ± 0.08

0.89 1.3 7.62

*0.25

± 0.06

0˚ – 15˚

Unit: mm

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